diff --git a/requirements-dev.txt b/requirements-dev.txt
index c9e6fcc..30b745f 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -120,7 +120,7 @@ types-requests==2.33.0.20261006
     # via pyUSPTO (pyproject.toml)
 typing-extensions==4.16.0
     # via mypy
-tzdata==2026.5
+tzdata==2026.6
     # via pyUSPTO (pyproject.toml)
 urllib3==2.8.0
     # via
diff --git a/requirements.txt b/requirements.txt
index d5a2b07..c7de46a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ idna==3.20
     # via requests
 requests==2.34.2
     # via pyUSPTO (pyproject.toml)
-tzdata==2026.5
+tzdata==2026.6
     # via pyUSPTO (pyproject.toml)
 urllib3==2.8.0
     # via